<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<style>
#W {
  top: 0;
  left: 0;
  width: 200px;
  height: 240px;
  position: absolute;
  background-color: rgba(255, 0, 0, 0.2);
}

iframe {
  backface-visibility: hidden; /* force compositing */
}
</style>
</head>
<body>
  <iframe id="I" width="200" height="240" src="/cross-site/baz.com/title1.html" frameborder="0" allowfullscreen=""></iframe>
  <div id="W"></div>
</body>
</html>
